546 



THE STUDY OF INSECTS, 



ruined at the outset. The appearance of these insects 

 when in the ground, as seen through the glass side of one 



of our root- 

 cages, is 

 shown in 

 Fig. 657. 



There 

 is a vast 

 number of species of click- 

 beetles; more than five nun- 



Fig. 659.— Larva of Drasterins etegans : 



Fig. 657 -A corn-plant growing in a root- Z\£ ype ™jjj ?™t^t '' '' ^^ ' ** 

 cage infested b£ wire-worms and click- ^ ula ! '■ caudal segment, 

 beet'es (from a specimen in the Cornell 



Insectary). The spotted beetle represented dred have been described 

 near the base of the plant is Drasterius 



elegans; that near the top of the plant is f rom North America alone. 

 Agriotes mancus. 



It is quite difficult to sep- 

 arate the closely-allied species, as there is but little variation 

 in shape and color. The larvae also show comparatively 



